Take Jaguar's 542-horsepower, supercharged V-8 engine and drop it under the hood of the
XJ sedan and you get the 2014 Jaguar XJR. I'm certain that the resulting noise and 0-60 time will be nothing to thumb your nose at, but I think that Jaguar's claim of "supercar performance" is a teeny-tiny-tad hyperbolic. Still, I'd love to settle in behind the wheel.